Paper cutter back gauge mounting



July 16,1957 F. BARNEY ETAL. 2,799, 8

PAPER CUTTER BACK GAUGE MOUNTING Filed June 16, 1953 s sums-sheet 1 1m; enters Freeman Barneq Mic'hae\ EPapanoli y 1957 F. BARNEY ETAL I 2,799,338 I PAPER CUTTER BACK GAUGE MOUNTING Filed June 16, 1953 s Sheets-Sheet 2 l T ii? fig; 2.4 26 24 7 I 'Tnucnfors Michau E flpommi I sw m uly 6, 195? F. BARNEY ETAL 2,799,338 PAPER CUTTER BACK GAUGE MOUNTING 3 Sheets-Sheet 3 Filed June 16 1953 2,799,338 Patented July 16, 1957 PAPER CUTTER BACK GAUGE MOUNTING Freeman Barney and Michael E. Papanoli, Spring Lake,

Mich., assignors to The Challenge Machinery Company, Grand Haven, Mich., a corporation of Michigan ApplicationJune 16, 1953, Serial No. 362,010

7 1 Claim. (Cl. 16459) This invention relates to the mounting of a back gauge used on a paper cutter. A paper cutter such as utilizes a back gauge of this nature comprises a horizontal table on which stacks of paper are placed and a knife, which is forcibly moved downward to cut the paper to predetermined size. The back gauge is located on the table back of the knife, and the stack of paper is laid against it and the back gauge must be adjustable on the table relative to the knife so that the paper can be cut into different dimen- When the back gauge is set for any desired paper cutting dimension it must be clamped rigidly in place and must closely engage the table so that sheets of paper cannot slip under it. The back gauge is provided with a manually operable clamp which is releasable to enable the back gauge to be adjusted on the table for different paper dimensions, and when clamped it must be brought and rigidly held in alignment with the knife for paper cutting accuracy.

The back gauge must be adjustable on its mounting so that it will be in exact alignment with the knife, and its construction should be relatively simple and easily operable.

The invention is hereafter more fully described, reference being had to the accompanying drawings, in which:

Fig. l is a plan view of a paper cutter table with a part broken away and with the back gauge thereon,

Fig. 2 is a side elevation of the table and back gauge with parts broken away,

Fig. 3 is an enlarged longitudinal sectional elevation of the back gauge and its mounting on the line 3-3 of Fig.5,

Fig. 4 is a transverse sectional elevation of the central part of the back gauge and its mounting on the line 4-4 of Fig. 3,

Fig. 5 is an enlarged plan view of the central part of the back gauge,

Fig. 6 is a fragmentary section of a part of the back gauge and its mounting on the line 66 of Fig. 3,

Fig. 7 is a fragmentary detail of the mounting of the operating shaft, and

Fig. 8 is another fragmentary mechanism for the operating shaft.

Like reference numbers refer to like parts in all of the figures.

The paper cutter has a horizontal work table 1 supported by suitable frame work not shown. The back gauge 2 is movably supported on the top of the table and is connected to the back gauge mounting, a part of which slides in the slots 3 which extends through the table top.

The back gauge mounting comprises a guide 4 which is rigidly attached to the under side of the back gauge 2 and extends through and traverses the slot 3 which has downwardly and outwardly tapering sides 5. A wedge 6, which has tapered sides corresponding to the sides of detail of operating the slot 3, straddles the central portion of the guide 4, and has a limited vertical movement.

The guide 4 has spaced downwardly, extending hanger members 7 in each of which is rotatably mounted a bushing 8, each having a flange 9 at its inner end. The bushings 8 have square holes extending axially through them, and a square operating shaft extends through those holes under the slot 3 and is rotatably mounted at each of its ends, which are provided with bushings 11 journaled in bearing members 12 on the under side of the table 1.

On the square shaft 10, between the hanger members 7 and the flanges 9 of the bushings 8, is mounted an eccentric member 13, said eccentric member and bushings 8 being freely slidable longitudinally on the shaft 10. The eccentric member 13 bears against the under side of the wedge 6, which has a hook 14 extending downwardly to embrace the eccentric member 13 and engage its lower side.

Rotation of the square shaft 10 and like rotation of the eccentric member 13 in one direction pushes upwardly on the wedge 6 and pulls downwardly on the guide 4 through its hanger members 7. The guide being connected to the under side of the back gauge, this action pulls the back gauge snugly against the top of the table 1 and forces the wedge upwardly into the tapered slot 3 bringing the back gauge into its proper position and clamping-it firmly in place. Reverse rotation of the shaft 10 and eccentric member 13 releases the wedge and through the hook 14 moves it downwardly, which frees the back gauge for longitudinal adjustment on the table.

The back gauge may be moved on the table by any suitable means, and the shaft 10 may be manually rotated by suitable means. The means for rotating the shaft 10 which is shown, consists of a crank 15 attached to the front end of the shaft and a hand lever 16 mounted on the under side of the table 1 near its front end and connected to the crank 15 by a link 17.

The parallelism of the back gauge with the knife of the paper cutter may be adjusted by means of its connections with the guide 4, which are as follows: A screw 20 passes through the front part of the back gauge and is screwed into the guide 4. A bushing 21 surrounds the screw 20 and acts as a pivot. A second screw 22 passes through the rear part of the back gauge and is screwed into the guide 4. The hole 23 in the back gauge, through which the screw 22 passes, is considerably larger than the screw so that when both screws 20 and 22 are loosened the back gauge may be pivoted about the bushing 21 sufliciently to attain the desired adjustment, after which both screws are tightened to lock the back gauge to the guide.

To aid in adjusting the back gauge on the guide, a threaded shaft 24 extends between flanges 25 on the back gauge and a prong 26 extends upwardly from the guide through a hole 27 and straddles the shaft 24. Nuts 28 on the shaft 24 at the opposite sides of the prong 26 may be turned in either direction to cause pivoting movement of the back gauge relative to the guide 4 and about the bushing 21.

By this mechanism the back gauge, after having once been properly adjusted on the guide 4, when unclamped, may be freely moved on the table to any desired position relative to the knife, and then by rotation of the shaft 10 and eccentric 13, the wedge 6 is thrust upwardly into the tapered slot 3 which draws all parts into proper position and clamps them firmly in place. In this respect it is to be noted that the wedge 6, where it straddles the guide 4, has a very close fit so that when the wedge is forced upwardly in the slot 3 the guide and back gauge attached to it will be accurately located.

This construction is extremely simple to manufacture,

3 assemble and manipulate. Few parts are required to attain the desired result. The parts which must be accurately machined, such as the sides of the tapered slot 3, the tapered sides of the wedge 6, the groove in the wedge which receives the guide 4, and that portion of theguide which fits into the groove of the wedge, are all easily available for machine operation.

The invention is defined by the appended claim and is to be considered comprehensive of all forms coming within its scope.

We claim:

A structure of the class described, comprising, a table having an elongated slot therein, said slot having downwardly and outwardly tapering sides, a back gauge movably mounted on the upper surface of said table over said slot, a guide traversable of said slot and adjustably connected to the under side of the back gauge, a manually rotatable shaft extending under said table and parallel to said slot, said shaft having a rotatable and slidable bearing on said guide, a wedge member adjacent said guide and traversable of said slot, an eccentric member slidably 4 and non-rotatably mounted on said shaft and bearing against said wedge and acting, when rotated with said shaft, to force said wedge into said slot and to pull downwardly on said guide and back gauge, said wedge straddling a portion of said guide and having a close sliding fit therewith.

References Cited in the file of this patent UNITED STATES PATENTS 728,424 Stefr'e et al. May 19, 1903 1,018,111 Holdt Feb. 20, 1912 1,191,750 Wadhams July 18, 1916 1,752,125 Thorne Mar. 25, 1930 1,808,388 Tyler et al June 2, 1931 1,895,440 Barney Jan. 31, 1933 1,923,293 Berry Aug. 22, 1933 2,176,512 Schwarcz Oct. 17, 1939 FOREIGN PATENTS 627,741 Germany Mar. 23, 1936 

